谭琲琳1,2,
王莉淋1,
1.四川农业大学环境学院，四川省农业环境工程重点实验室，成都 611130
2.中国科学院大学，北京 100049
基金项目: 四川省科技计划项目2017SZ0039四川省科技计划项目(2017SZ0039)
Control of heavy metal pollution in urban street dust by passivators
ZHENG Yuling1,,TAN Beilin1,2,
WANG Lilin1,
1.Sichuan Key Laboratory of Agricultural Environmental Engineering, College of Environmental Sciences, Sichuan Agricultural University, Chengdu 611130, China
2.University of Chinese Academy of Sciences, Beijing 100049, China
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摘要:为控制城镇街道灰尘中重金属污染，降低重金属生物有效性，采用向街道灰尘样品加入钝化剂溶液的方法，分别研究了不同施用量的单一钝化剂K2HPO4和Na2SiO3以及2种钝化剂以不同质量比组成的混合钝化剂对成都市街道灰尘中的Cu、Pb和Cd的生物有效性的影响。结果表明，在K2HPO4或Na2SiO3施用量为灰尘质量的1%时，即可有效钝化灰尘中的Cu、Pb和Cd，使其生物有效性分别降低27.9%、33.9%、53.2%或36.1%、34.4%、48.5%；继续提高钝化剂的施用量对降低灰尘中重金属生物有效性无显著作用；当总钝化剂施用量不变时，K2HPO4和Na2SiO3以1∶1组成混合钝化剂对灰尘中Cu和Pb的钝化效果优于单一钝化剂。使用重金属钝化剂可降低街道灰尘中重金属的生物有效性，在城市环卫喷洒用水中添加适量钝化剂一定程度上会达到控制飞灰与控制重金属污染的双重目的。
关键词: 街道灰尘/
重金属污染/
钝化剂/
重金属生物有效性
Abstract:In order to control the pollution of heavy metals in urban street dust and reduce their bioavailability, passivation experiments were conducted through adding passivator solution to urban street dust. The effects of single passivator (K2HPO4 or Na2SiO3) with different dosages and mixed passivators with different weight ratios of K2HPO4 and Na2SiO3 on the bioavailability of Cu, Pb and Cd in urban street dust of Chengdu were studied, respectively. The results showed that at the dosage of 1% dust for K2HPO4 or Na2SiO3, Cu, Pb and Cd in urban street dust could be effectively deactivated with the bioavailability reduction of 27.9%, 33.9% and 53.2% or 36.1%, 34.4 and 48.5%, respectively. The bioavailability of heavy metals could not be significantly cut down with a further increase of the passivator dosage. When the total dosages of these two passivators remained unchangeable, their mixture with a weight ratio of 1∶1 presented a better Cu and Pb passivation effects than each passivator. It is feasible to use passivators to reduce the bioavailability of heavy metals in urban street dust. And to a certain extent, adding passivators to the water of city sprinkler can achieve the dual-goal of both flying dust and heavy metal pollution control.
Key words:street dust/
heavy metal pollution/
passivators/
bioavailability of heavy metals.
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利用钝化剂控制城镇街道灰尘重金属污染
郑煜绫1,,谭琲琳1,2,
王莉淋1,
1.四川农业大学环境学院，四川省农业环境工程重点实验室，成都 611130
2.中国科学院大学，北京 100049
基金项目: 四川省科技计划项目2017SZ0039四川省科技计划项目(2017SZ0039)
关键词: 街道灰尘/
重金属污染/
钝化剂/
重金属生物有效性
摘要:为控制城镇街道灰尘中重金属污染，降低重金属生物有效性，采用向街道灰尘样品加入钝化剂溶液的方法，分别研究了不同施用量的单一钝化剂K2HPO4和Na2SiO3以及2种钝化剂以不同质量比组成的混合钝化剂对成都市街道灰尘中的Cu、Pb和Cd的生物有效性的影响。结果表明，在K2HPO4或Na2SiO3施用量为灰尘质量的1%时，即可有效钝化灰尘中的Cu、Pb和Cd，使其生物有效性分别降低27.9%、33.9%、53.2%或36.1%、34.4%、48.5%；继续提高钝化剂的施用量对降低灰尘中重金属生物有效性无显著作用；当总钝化剂施用量不变时，K2HPO4和Na2SiO3以1∶1组成混合钝化剂对灰尘中Cu和Pb的钝化效果优于单一钝化剂。使用重金属钝化剂可降低街道灰尘中重金属的生物有效性，在城市环卫喷洒用水中添加适量钝化剂一定程度上会达到控制飞灰与控制重金属污染的双重目的。
English Abstract
Control of heavy metal pollution in urban street dust by passivators
ZHENG Yuling1,,TAN Beilin1,2,
WANG Lilin1,
1.Sichuan Key Laboratory of Agricultural Environmental Engineering, College of Environmental Sciences, Sichuan Agricultural University, Chengdu 611130, China
2.University of Chinese Academy of Sciences, Beijing 100049, China
Keywords: street dust/
heavy metal pollution/
passivators/
bioavailability of heavy metals
Abstract:In order to control the pollution of heavy metals in urban street dust and reduce their bioavailability, passivation experiments were conducted through adding passivator solution to urban street dust. The effects of single passivator (K2HPO4 or Na2SiO3) with different dosages and mixed passivators with different weight ratios of K2HPO4 and Na2SiO3 on the bioavailability of Cu, Pb and Cd in urban street dust of Chengdu were studied, respectively. The results showed that at the dosage of 1% dust for K2HPO4 or Na2SiO3, Cu, Pb and Cd in urban street dust could be effectively deactivated with the bioavailability reduction of 27.9%, 33.9% and 53.2% or 36.1%, 34.4 and 48.5%, respectively. The bioavailability of heavy metals could not be significantly cut down with a further increase of the passivator dosage. When the total dosages of these two passivators remained unchangeable, their mixture with a weight ratio of 1∶1 presented a better Cu and Pb passivation effects than each passivator. It is feasible to use passivators to reduce the bioavailability of heavy metals in urban street dust. And to a certain extent, adding passivators to the water of city sprinkler can achieve the dual-goal of both flying dust and heavy metal pollution control.
